Starting today, the Sound Transit Link Light Rail line from Westlake to Tukwila is officially open. This weekend, everyone rides for free. (As of noon, that's been about 13,000 people.) Paid service starts on Monday. Transit officials said yesterday that the system is ready to go. Fourteen two-car trains are operating all weekend. On Monday, 14 trains will be operating during peak hours and 12 trains at all other times.

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